Method for preparing naphthalene series water reducing agent

A technology of naphthalene-based water reducer and naphthalenesulfonic acid, which is applied in the field of preparation of concrete admixtures, can solve problems such as pollution of the environment by calcium sulfate waste residue, labor, waste of energy consumption and raw materials, and quality of sodium sulfate, so as to improve production efficiency and Effects of factors such as social benefits, reduction of raw material costs, and reduction of environmental pollution

Active Publication Date: 2010-06-09
ZHEJIANG JISHENG CHEM BUILDING MATERIALS
View PDF0 Cites 32 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The main defect of this production process is: there is a lot of excess sulfuric acid in the production process, and only using liquid caustic soda to neutralize will cause the sodium sulfate content in the final product to exceed the standard and affect the quality. It is necessary to add calcium hydroxide to further neutralize the excess sulfuric acid. As a result, the generation of calcium sulfate waste residue pollutes the environment, and the products wrapp

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method for preparing naphthalene series water reducing agent
  • Method for preparing naphthalene series water reducing agent
  • Method for preparing naphthalene series water reducing agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Such as figure 1 As shown in the process flow, the production process of high-concentration naphthalene-based water reducer mainly includes steps such as melting naphthalene, sulfonation reaction, steam hydrolysis to remove naphthalene, recovery and application of naphthalene, condensation reaction, and neutralization reaction.

[0027] The specific method is as follows:

[0028] (1) Melting naphthalene. Put 3000kg (23.4kmol) of industrial naphthalene in a melting tank and melt it to obtain molten industrial naphthalene at 100°C.

[0029] (2) Sulfonation reaction. The liquid industrial naphthalene of above-mentioned step (1) gained molten state is squeezed in the sulfonation kettle by metering pump, simultaneously 2000Kg 98% concentrated sulfuric acid (20.4kmol) is squeezed into sulfuric acid head tank (industrial naphthalene: sulfuric acid mol ratio=1.15: 1 ), the temperature in the kettle was raised to 140°C, and the metered concentrated sulfuric acid was evenly ad...

Embodiment 2

[0037] With the 460Kg industrial naphthalene recovered in 2560Kg industrial naphthalene and embodiment 1, the 37% formaldehyde consumption in the step (5) is changed into 1550Kg, and the liquid high-concentration type naphthalene series high-efficiency water reducing agent of step (6) will neutralize the reaction to finish gained The finished product is directly sent to the spray tower for spray drying to obtain the finished solid high-concentration naphthalene-based high-efficiency superplasticizer, and other steps remain unchanged.

[0038] (1) Melted naphthalene

[0039] Industrial naphthalene 2560kg and naphthalene 460kg reclaimed according to the method described in example 1 are concentrated in melting tank and melted, and liquid industrial naphthalene (23.6kmol) of molten state is obtained at 100 ℃;

[0040] (2) Sulfonation reaction:

[0041]The liquid industrial naphthalene of the molten state obtained in the above step (1) is squeezed into the sulfonation kettle by a...

Embodiment 3

[0050] Embodiment 3 (comparative example):

[0051] Melt 2400Kg (18.75kmol) industrial naphthalene in the naphthalene melting kettle, put the liquid industrial naphthalene in the molten state into the sulfonation kettle, add 2659Kg (26.59kmol) concentrated sulfuric acid to carry out sulfonation at 120~160°C (naphthalene: concentrated sulfuric acid=1 : 1.4), sulfonated for about 3 hours, poured into the hydrolysis kettle to cool down to 120°C, added 1100Kg tap water to the kettle for hydrolysis reaction for 45-60min, cooled down after hydrolysis, poured into the condensation kettle, and added dropwise 1400Kg of 37% formaldehyde at about 80°C (17.27kmol) to carry out the condensation reaction, the dropwise addition is completed at 100°C and the condensation reaction is about 5 to 6 hours. After cooling down, put 525Kg of calcium hydroxide into the neutralization tank and stir for one hour, then add 3000Kg of liquid sodium hydroxide (concentration 30%) to adjust the pH value to 7...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The invention provides a method for preparing a naphthalene series water reducing agent. The method comprises the following steps of naphthalene fusion, sulphonation reaction, steam hydrolysis naphthalene removal, recovery and reuse of naphthalene, condensation reaction and neutral reaction. Compared with the conventional production technology, the process of the invention has the advantages that: the consumption of sulfuric acid is reduced by adjusting a material charging ratio of sulfuric acid to material naphthalene at the step of sulphonation reaction; the step of the recovery and reuse of naphthalene is added, so that the raw materials are fully utilized; and in the following step of neutral reaction, only a small amount of alkali solution is added and the addition of calcium hydroxide is unnecessary, so that the filter step is eliminated, and deposition loss and entrainment loss of the products are avoided.

Description

(1) Technical field [0001] The invention relates to a method for preparing a concrete admixture, in particular to a method for preparing a high-concentration naphthalene-based water reducer or a homologous dispersant thereof. (2) Background technology [0002] Due to the needs of industrial development, people have put forward higher and higher requirements for the performance of concrete, and a necessary condition for realizing the high performance of concrete is the use of high-efficiency water reducing agent, which can not only improve construction conditions, but also improve the compressive and flexural resistance of concrete Strength, but also can enhance the performance of concrete such as frost resistance and impermeability, is considered to be the fifth component necessary for concrete. At present, most of the high-efficiency water reducers used in China are naphthalene-based water reducers. However, in its production process, due to the use of excessive concentrat...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): C07C309/36C07C303/22C08G16/02C04B24/22C04B103/30
Inventor 金瑞浩李应斌
Owner ZHEJIANG JISHENG CHEM BUILDING MATERIALS
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap